##双循环 列表生成式,注意是中括号
L=[x+x1 for x in range(1,5) for x1 in range(3,9)]##两者的全排列
print(L)
L2=[]
for x in range(1,5):
    for x1 in range(3,9):
        L1=x+x1
        L2.append(L1)
        print(L2)